M DET14C and DET24C Digital Earth Clamp-on Tester USER GUIDE 1
G SAFETY WARNINGS These safety warnings are provided to ensure the safety of personnel and proper operation of the instrument. ■ Safety warnings and precautions must be read and understood before the instrument is used. They must be observed during use. ■ Do not leave the instrument connected to the system under test when not in use. ■ Do not touch circuit connections and exposed metalwork of the installation or equipment under test.
CONTENTS G SAFETY WARNINGS ..................................................................... 2 CONTENTS....................................................................................... 3 GENERAL DESCRIPTION ................................................................ 4 APPLICATION................................................................................... 6 MODES OF OPERATION ................................................................. 8 GENERAL OPERATION...........................
GENERAL DESCRIPTION The DET14C and DET24C represent a new generation of earth/ground clamp-on resistance testers. These instruments induce a test current into earth systems and measure ground resistance in multi ground installations without needing to disconnect the ground. They offer market leading access, advanced features, simple operation and CAT IV 600 V safety protection.
Figure 1: DET14C / DET24C Instrument Front View 1. 2. 3. 4. 5. Clamp jaws Tactile barrier Rotary switch HOLD button LCD display 6. 7. 8. 9.
Figure 3: DET14C / DET24C Instrument Bottom View 1. Wrist strap loop 2.
APPLICATION The DET14C / DET24C digital earth clamp meters are particularly suitable for measuring earth resistance in various installations such as buildings, pylons and RF transmitter sites without system disconnection. In addition, they can be used for the inspection and verification of lightning protection systems and virtually any installation where a current loop can be generated.
MODES OF OPERATION The DET14C / DET24C can operate in one of three main modes, selected using the rotary switch: Figure 6: Main mode selection using the rotary switch OFF – Turn instrument off Ω - Resistance measurement A - Current measurement Fn - Setup and configuration When in a measurement mode, there are other functions which are selected using the buttons: HOLD – Hold the displayed measurement value. – Enable / disable display backlight. - Enable / disable buzzer function.
GENERAL OPERATION Measuring Resistance Mode Powering on the Instrument The instrument is switched on by turning the rotary switch to one of the three mode positions, i.e. Ω, A or Fn. The Ω (resistance) and A (AC current) measurements are both autoranging. With the resistance (Ω) mode selected simply open the clamp and clamp around a ground conductor to be measured. The instrument automatically senses the jaw opening and activates the open jaw icon ( ) on the display.
HOLD Saving Data The HOLD key can be used to freeze a result in either resistance or current mode. Once held, the result can be saved to memory using the save () button. Data is saved in either resistance mode (Ω) or current mode (A). Pressing the save key () will record a result with a time and date stamp. It is important to regularly ensure that the time and date settings are correct. Time and date are set from the Function mode (Fn).
Recalling Data Stored data can be recalled and viewed on the instrument from the recall records ( ) function, which is the default screen on switching to function mode (Fn). Press the OK button to enter the recall function. Results are showed with an index number. Pressing the right arrow button () will show the result and date the result was taken and a second press of the right arrow button () will show the time the result was recorded on that day.
being downloaded. On completion of the download the instrument returns to the Function mode (Fn). PowerDB shows results being loaded at the top of the form. When the download completes the results are shown in a spreadsheet window in front of the main PowerDB form. Select all data or specific data required for import and click OK. Data should appear in the form. Complete relevant data and information as required and save the form with a name of your choice.
GENERAL SPECIFICATIONS Maximum jaw opening Maximum jaw inner dimensions Display type Battery type Battery life Auto power down Data logging Data download Range selection Sample time Hold function Alarm function Warning buzzer Operating temperature and humidity Storage temperature and humidity Weight Instrument dimensions IP rating 39 mm 39 mm x 55 mm 4 digit + 6 digit with backlight 4x 1.
Operational Error for Resistance MEASUREMENT SPECIFICATIONS Parameter Operating Position Reference Conditions Temperature Humidity Battery Voltage +20 °C ± 3 °C 50% RH ± 10% 6 V ± 0.2 V Conductor Position Battery Voltage Operating Position Conductor Position Instrument horizontal Perpendicular to jaws and centred in the aperture Temperature Current Resistance Interference Current Interference Voltage Sinusoidal (THD <0.
Operational Error for Current Parameter Operating Position Conductor Position Battery Voltage Frequency of Current Specification Instrument Horizontal IEC 61557-13 E1 ±30 ° IEC 61557-13 E2 4.4 V to 7.0 V IEC 61557-13 E3 0 °C to +35 °C IEC 61557-13 E9 IEC 61557-13 E11 10 A/m Class 3 30 A/m Class 2 100 A/m Class 1 IEC 61557-13 E12 0.2 mArms to 35 Arms (50 Hz and 60 Hz) IEC 61557-13 E14 162/3Hz to 400 Hz Repeatability IEC 61557-13 E15 Temperature Distortion Magnetic Field Load Current Typical 0.
ORDERING INFORMATION AND ACCESSORIES PREVENTIVE INSTRUMENT MAINTENANCE DET14C Digital Earth Test Clamp-on meter DET24C Digital Earth Test Clamp-on meter 1000-761 1000-762 Included Accessories (DET14C and DET24C) Carrying case Carrying strap (wrist loop) User guide CD-ROM Calibration check Battery AA (Alkaline) (4 required) 1001-715 1001-716 1001-198 1001-498 25511-841 1. The DET series instruments require very little maintenance. 2. Test leads should be checked before use to ensure there is no damage.
REPAIR AND WARRANTY The instrument circuit contains static sensitive devices, and care must be taken in handling the printed circuit board. If the protection of an instrument has been impaired it should not be used, and be sent for repair by suitably trained and qualified personnel.
Returning an Instrument for Repair If returning an instrument to the manufacturer for repair, it should be sent freight pre-paid to the appropriate address. A copy of the invoice and of the packing note should be sent simultaneously by airmail to expedite clearance through Customs. A repair estimate showing freight return and other charges will be submitted to the sender, if required, before work on the instrument commences.
